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Weeping on all sprinklers, none will operate fully

Hi, I am trying to get my sprinkler system fired up after what Im guessing is close to 2 years of no use. Previous owner used it a little 2 years ago and I did not use it at all last year. From what I can tell is going on from what little reading I have done here is I have some faulty valves. It seems like all of the sprinkler heads are weeping no mater what state the solenoid is in. I took one of my valves apart today and found alot of dirt and debris in it, after cleaning that out and re installing everything I am still out of luck on that valve, not to mention the 8 others I have which I haven't torn apart yet.

My valves are Hunter PGV 1 inch with NO flow control. I should also mention I tried manual as well as electronic operation with my cleaned valve, the solenoids appear to be in working order.

Is it possible the diaphragms are all bad after sitting for so long with out use?

Well I can happily report a success. I cleaned 5 more valves tonight and was able to build up more pressure in the system, because of this all valves I have cleaned are running as intended. I still have 4 left to clean but think I have this figured out now.